It's probably Monster Hunter for Switch -- as that's probably the only game that they can hope to get 2 million copies sold.

Quote:

Capcom teases “major title” due out before March 31, 2018 - Capcom expects to sell two million copies of Marvel vs. Capcom: Infinite.

Capcom plans to launch a “major title” before March 31, 2018, Capcom listed in its strategies and plans overview for the fiscal year ending March 31, 2018.

It is unknown whether it is an announced title—such as the long-dormant Deep Down or the Resident Evil 2 Remake—or something completely new.

The company also said it expects to sell two million copies of Marvel vs. Capcom: Infinite, which launches September 19, and two million more copies of Resident Evil 7: biohazard, which launched on January 24, by March 31, 2018.